LLM代理应用实战：构建Plotly数据可视化代理

#Optional pre-processing
 import pandas as pd
 import numpy as np
 
 
 df = pd.read_csv('WARN Notices California_Omer Arain - Sheet1.csv')
 
 #Changes date like column into datetime
 df['Received Date'] = [pd.to_datetime(x) for x in df['Received Date']]
 df['Effective Date'] = [pd.to_datetime(x) for x in df['Effective Date']]
 #Converts numbers stored as strings into ints
 df['Number of Workers'] = [int(str(x).replace(',','')) if str(x)!='nan' else np.nan for x in df['Number of Workers']]
 # Replacing NULL values
 df = df.replace(np.nan,0)

from llama_index.core.readers.json import JSONReader
 from llama_index.core import VectorStoreIndex
 import json
 
 # Function that stores the max,min & mean for numerical values
 def return_vals(df,c):
    if isinstance(df[c].iloc[0], (int, float, complex)):
        return [max(df[c]), min(df[c]), np.mean(df[c])]
 # For datetime we need to store that information as string
    elif(isinstance(df[c].iloc[0],datetime.datetime)):
        return [str(max(df[c])), str(min(df[c])), str(np.mean(df[c]))]
    else:
 # For categorical variables you can store the top 10 most frequent items and their frequency
        return list(df[c].value_counts()[:10])
 
 # declare a dictionary
 dict_ = {}
 for c in df.columns:
 # storing the column name, data type and content
  dict_[c] = {'column_name':c,'type':str(type(df[c].iloc[0])), 'variable_information':return_vals(df,c)}
 # After looping storing the information as a json dump that can be loaded
 # into a llama-index Document
 
 # Writing the information into dataframe.json
 
 with open("dataframe.json", "w") as fp:
    json.dump(dict_ ,fp)
 
 
 reader = JSONReader()
 # Load data from JSON file
 documents = reader.load_data(input_file='dataframe.json')
 
 # Creating an Index
 dataframe_index = VectorStoreIndex.from_documents(documents)

from llama_index.core import Document
 from llama_index.core import VectorStoreIndex
 
 styling_instructions =[Document(text="""
  Dont ignore any of these instructions.
        For a line chart always use plotly_white template, reduce x axes & y axes line to 0.2 & x & y grid width to 1.
        Always give a title and make bold using html tag axis label and try to use multiple colors if more than one line
        Annotate the min and max of the line
        Display numbers in thousand(K) or Million(M) if larger than 1000/100000
        Show percentages in 2 decimal points with '%' sign
        """
        )
        , Document(text="""
        Dont ignore any of these instructions.
        For a bar chart always use plotly_white template, reduce x axes & y axes line to 0.2 & x & y grid width to 1.
        Always give a title and make bold using html tag axis label and try to use multiple colors if more than one line
        Always display numbers in thousand(K) or Million(M) if larger than 1000/100000. Add annotations x values
        Annotate the values on the y variable
        If variable is a percentage show in 2 decimal points with '%' sign.
        """)
 
 
        # You should fill in instructions for other charts and play around with these instructions
        , Document(text=
          """ General chart instructions
        Do not ignore any of these instructions
          always use plotly_white template, reduce x & y axes line to 0.2 & x & y grid width to 1.
        Always give a title and make bold using html tag axis label
        Always display numbers in thousand(K) or Million(M) if larger than 1000/100000. Add annotations x values
        If variable is a percentage show in 2 decimal points with '%'""")
          ]
 # Creating an Index
 style_index = VectorStoreIndex.from_documents(styling_instructions)

#All imports for this section
 from llama_index.core.agent import ReActAgent
 from llama_index.core.tools import QueryEngineTool
 from llama_index.core.tools import ToolMetadata
 from llama_index.llms.groq import Groq
 
 
 # Build query engines over your indexes
 # It makes sense to only retrieve one document per query
 # However, you may play around with this if you need multiple charts
 # Or have two or more dataframes with similar column names
 dataframe_engine = dataframe_index.as_query_engine(similarity_top_k=1)
 styling_engine = style_index.as_query_engine(similarity_top_k=1)
 
 # Builds the tools
 query_engine_tools = [
    QueryEngineTool(
        query_engine=dataframe_engine,
 # Provides the description which helps the agent decide which tool to use
        metadata=ToolMetadata(
            name="dataframe_index",
            descriptinotallow="Provides information about the data in the data frame. Only use column names in this tool",
        ),
 \
    ),
    QueryEngineTool(
 # Play around with the description to see if it leads to better results
        query_engine=styling_engine,
        metadata=ToolMetadata(
            name="Styling",
            descriptinotallow="Provides instructions on how to style your Plotly plots"
            "Use a detailed plain text question as input to the tool.",
        ),
    ),
 ]
 
 # I used open-source models via Groq but you can use OpenAI/Google/Mistral models as well
 llm = Groq(model="llama3-70b-8192", api_key="<your_api_key>")
 
 # initialize ReAct agent
 agent = ReActAgent.from_tools(query_engine_tools, llm=llm, verbose=True)

from llama_index.core import PromptTemplate
 
 new_prompt_txt= """You are designed to help with building data visualizations in Plotly. You may do all sorts of analyses and actions using Python
 
 ## Tools
 
 You have access to a wide variety of tools. You are responsible for using the tools in any sequence you deem appropriate to complete the task at hand.
 This may require breaking the task into subtasks and using different tools to complete each subtask.
 
 You have access to the following tools, use these tools to find information about the data and styling:
 {tool_desc}
 
 
 ## Output Format
 
 Please answer in the same language as the question and use the following format:
 
 ```
 Thought: The current language of the user is: (user's language). I need to use a tool to help me answer the question.
 Action: tool name (one of {tool_names}) if using a tool.
 Action Input: the input to the tool, in a JSON format representing the kwargs (e.g. {{"input": "hello world", "num_beams": 5}})
 ```
 
 Please ALWAYS start with a Thought.
 
 Please use a valid JSON format for the Action Input. Do NOT do this {{'input': 'hello world', 'num_beams': 5}}.
 
 If this format is used, the user will respond in the following format:
 
 ```
 Observation: tool response
 ```
 
 You should keep repeating the above format till you have enough information to answer the question without using any more tools. At that point, you MUST respond in the one of the following two formats:
 
 ```
 Thought: I can answer without using any more tools. I'll use the user's language to answer
 Answer: [your answer here (In the same language as the user's question)]
 ```
 
 ```
 Thought: I cannot answer the question with the provided tools.
 Answer: [your answer here (In the same language as the user's question)]
 ```
 
 ## Current Conversation
 
 Below is the current conversation consisting of interleaving human and assistant messages."""
 
 # Adding the prompt text into PromptTemplate object
 new_prompt = PromptTemplate(new_prompt_txt)
 
 # Updating the prompt
 agent.update_prompts({'agent_worker:system_prompt':new_prompt})

response = agent.chat("Give Plotly code for a line chart for Number of Workers get information from the dataframe about the correct column names and make sure to style the plot properly and also give a title")